radio95/fm95
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try a diffrent lpf

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KubaPro010
2025-03-27 18:09:20 +01:00
parent 0983b8db90
commit b2d97ef5e4
3 changed files with 28 additions and 30 deletions
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14
src/fm95.c
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@@ -414,11 +414,9 @@ int main(int argc, char **argv) {
init_preemphasis(&preemp_l, preemphasis_tau, sample_rate);
init_preemphasis(&preemp_r, preemphasis_tau, sample_rate);
Biquad lpf1_l, lpf1_r, lpf2_l, lpf2_r;
init_butterworth_lpf(&lpf1_l, 15000, 192000);
init_butterworth_lpf(&lpf1_r, 15000, 192000);
init_butterworth_lpf(&lpf2_l, 15000, 192000);
init_butterworth_lpf(&lpf2_r, 15000, 192000);
Biquad lpf_l, lpf_r;
init_chebyshev_lpf(&lpf_l, 15000, sample_rate, 1.0f);
init_chebyshev_lpf(&lpf_r, 15000, sample_rate, 1.0f);
signal(SIGINT, stop);
signal(SIGTERM, stop);
@@ -475,10 +473,8 @@ int main(int argc, char **argv) {
float ready_l = apply_preemphasis(&preemp_l, l_in);
float ready_r = apply_preemphasis(&preemp_r, r_in);
ready_l = biquad(&lpf1_l, ready_l);
ready_l = biquad(&lpf1_r, ready_r);
ready_l = biquad(&lpf2_l, ready_l);
ready_l = biquad(&lpf2_r, ready_r);
ready_l = biquad(&lpf_l, ready_l);
ready_l = biquad(&lpf_r, ready_r);
ready_l = hard_clip(ready_l*audio_volume, clipper_threshold);
ready_r = hard_clip(ready_r*audio_volume, clipper_threshold);